2-Butenedioic acid, 2-((diethoxyphosphinothioyl)thio)-, dimethyl ester, (Z)- 63917-07-7 CP 20220 Dimethyl (Z)-2-((diethoxyphosphinothioyl)thio)-2-butenedioate ENT 25,542 MALEIC ACID, MERCAPTO-, DIMETHYL ESTER, S-ESTER with O,O-DIETHYL PHOSPHORODITHIO Maleic acid, mercapto-, dimethyl ester, S-ester with O,O-diethyl phosphorodithioate Monsanto CP-20220